US7826153B2 - Lens assembly and method for manufacturing the same - Google Patents
Lens assembly and method for manufacturing the same Download PDFInfo
- Publication number
- US7826153B2 US7826153B2 US11/944,184 US94418407A US7826153B2 US 7826153 B2 US7826153 B2 US 7826153B2 US 94418407 A US94418407 A US 94418407A US 7826153 B2 US7826153 B2 US 7826153B2
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- Prior art keywords
- lens
- lenses
- curvature
- peripheral part
- substrate
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
Definitions
- a mobile appliance such as a portable phone equipped with a camera has been introduced, so that a still image and/or a moving picture can be taken regardless of time and locations.
- embodiments of the present invention address the above-mentioned problems occurring in the prior art.
- Implementations of the present invention provide a small-size lens assembly that can be mass-produced and a method for manufacturing the same.
- a method for manufacturing a lens assembly including: delineating and processing a surface of a lens substrate to form a plurality of lens units; bonding a plurality of such lens substrates having different properties to each other as one integrated body, and dicing the integrated body into a lens unit, thereby producing a plurality of lens assemblies.
- a lens assembly including a plurality of lenses formed by stacking and bonding a plurality of lens wafers, each lens wafer including a plurality of lens units, and dicing the stacked and bonded plurality of lens wafers, wherein the plurality of lenses each include curvature parts and peripheral parts, where the peripheral parts of the plurality of lenses are coupled to each other.
- a lens assembly including a first lens comprising a first curvature part having a first curvature and a first peripheral part formed in a vicinity of the first curvature part; and a second lens comprising a second curvature part having a second curvature and a second peripheral part formed in a vicinity of the second curvature part, wherein the first peripheral part is coupled to the second peripheral part, and side surfaces of the coupled first and second lenses are along a same vertical plane.
- FIG. 1 is a cross-sectional view showing a camera module.
- FIG. 2 is a flowchart showing the steps of manufacturing a lens assembly according to an embodiment of the present invention.
- FIGS. 3A to 3D are views showing a lens substrate and a color filter substrate according to an embodiment of the present invention.
- FIG. 4 is a view showing bonding and dicing steps according to an embodiment of the present invention.
- a camera module includes a lens assembly 10 having a plurality of lenses, a color filter 11 that can block ultraviolet rays, an image sensor 12 for sensing an image, a printed circuit board (PCB) 13 that is provided with a circuit pattern, a flexible PCB 14 that is connected with a connector, and a housing 15 that supports the lens assembly 10 and the color filter 11 .
- a lens assembly 10 having a plurality of lenses
- a color filter 11 that can block ultraviolet rays
- an image sensor 12 for sensing an image for sensing an image
- PCB printed circuit board
- flexible PCB 14 that is connected with a connector
- housing 15 that supports the lens assembly 10 and the color filter 11 .
- FIG. 2 is a flowchart showing the steps of manufacturing the lens assembly 10 according to an embodiment of the present invention.
- a lens assembly may be processed or molded by using glass or plastic.
- a lens substrate prepared in the form of an optical device for a lens is processed and then diced, such that a large amount of lens assemblies can be produced from a single lens substrate.
- a method for manufacturing the lens assembly 10 includes a substrate processing step (S 31 ), a bonding step (S 32 ), a dicing step (S 33 ), and an assembling step (S 34 ).
- each lens substrate and each color filter substrate are processed in such a manner that lenses can be formed in a plurality of lens units, delineating the surface of each of the lens substrates into several parts.
- a lens substrate can include borosilicate-based glass or crown-based glass.
- the lens substrate is an optical lens substrate.
- the optical lens substrate allows an aspherical lens, which has various curvatures in order to focus or disperse light, to be formed on the surface of the lens substrate.
- the surface of the lens substrate can be delineated into a plurality of lens units, and each lens unit is processed to have a predetermined curvature.
- a plurality of lenses having the same first curvature may be formed in the lens units formed on the surface of the lens substrate.
- a primary lens substrate 41 can be delineated with lens units including primary lenses 44 , each primary lenses having the same curvatures.
- a secondary lens substrate 42 can be delineated with secondary lenses 45 .
- the lens units of the secondary lenses 45 have a second curvature, which is different from that of the primary lenses 44 .
- a primary lens 44 includes a first curvature part 44 b having the first curvature and first peripheral parts 44 a having substantially no curvature in the vicinity of the first curvature pall 44 b.
- the secondary lens 45 includes a second curvature part 45 b having a second curvature and second peripheral pails 45 a having substantially no curvature in the vicinity of the second curvature part 45 b.
- the first peripheral part 44 a is provided in the vicinity of the first curvature part 44 b
- the second peripheral part 45 a is provided in the vicinity of the second curvature part 45 b.
- a 6-inch primary lens substrate 41 has 529 (23 ⁇ 23) lens units, and the primary lenses 44 having the first curvature are formed in each of the delineated lens units.
- 529 primary lenses 44 can be formed on the 6-inch primary lens substrate 41 .
- a 6-inch second lens substrate 42 can have 529 lens units, and the secondary lenses 45 having the second curvature are formed in each of the delineated lens units.
- 529 secondary lenses 45 can be formed on the 6-inch secondary lens substrate 42 .
- lens units are described in this embodiment as being formed on a 6-inch substrate, embodiments are not limited thereto.
- an 8-inch or larger diameter substrate can be used.
- 529 color filters 46 can be formed on a 6-inch color filter substrate 43 .
- An aspherical surface having various curvatures is formed between the primary and secondary lens substrates 41 and 42 . That is, the curvature of the primary lens 44 formed in each lens unit on the primary lens substrate 41 is different from the curvature of the secondary lens 45 formed in each lens unit on the second lens substrate 42 .
- the lens is a kind of a glass lens used for a camera module of a portable phone, a digital camera, and an optical storage unit, and can provide an image having quality superior to that of a plastic lens.
- the curvature of each lens unit may be directly formed by using a laser beam.
- the surface of the lens substrate can be processed by using a laser beam, so that a predetermined curvature may be formed with respect to each lens unit.
- the laser beam can be employed when a spherical curvature such as a convex/concave curvature is formed.
- a predetermined curvature may be formed with respect to each lens unit through a lithography process.
- an exposure and development process can be performed according to a mask pattern, thereby forming a curvature according to the mask pattern.
- the formation of the curvature of the lens substrates through a lithography process may be employed when forming an aspherical lens.
- lens units on a color filter substrate 43 are processed, thereby forming color filters 46 in each of the delineated lens units.
- FIG. 3D shows the integration of the color filters 46 and the primary and secondary lenses 44 and 45 .
- the first peripheral part 44 a of the primary lens 44 can be bonded to the second peripheral part 45 a of the secondary lens 45 , which can be bonded to the color filter 46 .
- the bonding step is performed to integrally bond the substrates to each other as one body (S 32 ).
- FIG. 4 which shows the bonding step (S 32 ) and the dicing step (S 33 ), the color filter substrate 43 , the secondary lens substrate 42 , and the primary lens substrate 41 that have been processed in the processing step are sequentially stacked on each other and then bonded to each other.
- inert gas can be injected and pumped down, and the bonded primary and secondary lens substrates 41 and 42 and color filter substrate 43 are heated at a final polymer curing temperature.
- the bonded substrates are compressed for the polymer curing time.
- a stop substrate 47 which can be formed with a silicon material, can be interposed between the primary lens substrate 41 and the secondary lens substrate 42 during the bonding step.
- the stop substrate 47 is a spacer that can be used to fix the primary lens substrate 41 to the secondary lens substrate 42 and adjust an amount of light to block useless light.
- the stop substrate 47 can adjust the interval between the lens substrates according to the thickness of the stop substrate 47 .
- stop substrate 47 is described in this embodiment as being interposed between the primary lens substrate 41 and the secondary lens substrate 42 , embodiments are not limited thereto.
- the stop substrate 47 may make contact with the front surface of the primary lens substrate 41 or the rear surface of the secondary lens substrate 42 .
- stop substrate 47 may be provided with holes passing through the stop substrate 47 .
- the holes passing through the stop substrate 47 can be used to adjust an amount of incident light. Therefore, the size of the holes can be determined by the number of lenses and a focal distance.
- the dicing step (S 33 ) is performed to dice the bonded substrates so that the bonded substrates are divided into lens assemblies 48 corresponding to the number of lens units.
- the dicing step (S 33 ) can be accomplished by using a blade in order to separate the lens units formed on the substrate from each other.
- a blade in order to separate the lens units formed on the substrate from each other.
- a 2′′ blade or a 4′′ blade is used according to the hardness of the substrate.
- the blade may be selected according to the hardness, the softness, the wear resistance, or a device characteristic.
- the blade can be a resin blade or a nickel blade.
- the diced lens assembly has a structure in which the first peripheral part 44 a of the primary lens 44 , the second peripheral part 45 a of the secondary lens 45 , and the color filter 46 are integrally bonded to each other.
- the side surfaces of the primary and secondary lenses 44 and 45 can be arranged on the same vertical plane.
- tertiary and quartic lens substrates can be added to the primary and secondary lens substrates of the lens assembly.
- the side surfaces of the tertiary and quartic lens generated from the tertiary and quartic lens substrates can be arranged in the same vertical plane as the primary and secondary lens substrates by bonding the four substrates to each other and then dicing them during the same step.
- the lens assemblies 48 can be coupled to housings 15 of camera modules and then assembled, thereby completing a lens module working process for camera modules corresponding to the number of lens units.
- an image sensor 12 is coupled to the housing 15 of the camera module.
- the image sensor 12 can be coupled to the housing 15 in a package type such as a chip scale package (CSP) in order to improve an image sensing capability of the camera module and realize a small-sized camera module.
- a package type such as a chip scale package (CSP) in order to improve an image sensing capability of the camera module and realize a small-sized camera module.
- CSP chip scale package
- the image sensor 12 is protected from impurities, so that the image sensor 12 is prevented from being contaminated.
- a reflow process can be performed to mount the lens assembly 48 on a camera module.
- even the image sensor 12 can be mounted on the camera module through the reflow process.
- the color filter substrate 43 , the secondary lens substrate 42 , and the primary lens substrate 41 are sequentially stacked on each other and bonded to each other in the bonding step (S 32 ), this is illustrative purpose only. According to another embodiment, the secondary substrate 42 and the primary lens substrate 41 can be bonded to each other without using the color filter substrate 43 .
- the color filter 46 can be previously (or initially) mounted on the housing 15 of the camera module. Then, a lens assembly, which is obtained by bonding the primary and secondary lens substrates 41 and 42 to each other, can be mounted on the housing 15 equipped with the color filter 46 .
- any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc. means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention.
- the appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment.
Abstract
Description
Claims (11)
Priority Applications (1)
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US12/913,233 US8879174B2 (en) | 2006-11-24 | 2010-10-27 | Lens assembly and method for manufacturing the same |
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KR10-2006-0116814 | 2006-11-24 | ||
KR1020060116814A KR20080047002A (en) | 2006-11-24 | 2006-11-24 | Lens assembly and method manufacturing the same for camera module |
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US12/913,233 Division US8879174B2 (en) | 2006-11-24 | 2010-10-27 | Lens assembly and method for manufacturing the same |
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US20080123199A1 US20080123199A1 (en) | 2008-05-29 |
US7826153B2 true US7826153B2 (en) | 2010-11-02 |
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US11/944,184 Active 2028-05-07 US7826153B2 (en) | 2006-11-24 | 2007-11-21 | Lens assembly and method for manufacturing the same |
US12/913,233 Active 2028-07-15 US8879174B2 (en) | 2006-11-24 | 2010-10-27 | Lens assembly and method for manufacturing the same |
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KR20080047002A (en) | 2008-05-28 |
US8879174B2 (en) | 2014-11-04 |
US20080123199A1 (en) | 2008-05-29 |
US20110038063A1 (en) | 2011-02-17 |
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